9.81Park is an eco-friendly gravity racing theme park featuring engineless racing carts that utilize gravitational force (g=9.81 m/s2) to race down sloping tracks. The goal of this interior architectural design was to make the experience of gravity racing more dynamic while creating an organic flow between all the facilities at the park. Our unique solution offers an exemplary service and customer experience, where visitors can enjoy engineless race cars for the first time in Korea. Borrowing from the 9.81 brand strategy, we focused on simple and intuitive smart elements and created spaces that only contain functional and necessary elements.